2

検索した結果、どこに進むべきかを理解するのに役立つものは何も見つかりませんでした。

これまでのところ、私はかなり単純な nHibernate クエリしか書いておらず、比較的複雑な SQL クエリを QueryOver (Icriteria) で送り出す必要があります。以下のクエリを見つけてください。

Select aliasTable1.Id, AliasTable1.Time, 
       AlaisTable2.Version,
       (select top 1 secondAliasTable1.Time
          from Table1 secondAliasTable1
          where aliasTable1.Time < secondAliasTable1.Time
            AND secondAliasTable1.Time < (SELECT Top 1 thirdAliasTable1.Time from Table1 thirdAliasTable1 
                                            where thirdAliasTable1.Name = 'stringValue1'
                                              AND thirdAliasTable1.Id = aliasTable1.Id
                                              AND thirdAliasTable1.Time > aliasTable1.Time
                                            ORDER By thirdAliasTable1.Time)
            AND secondAliasTable1.Name = 'stringValue2'
            AND secondAliasTable1.Id = aliasTable1.Id
            ORDER BY secondAliasTable1.Time) As 'Endtime'
  from Table1 aliasTable1
    INNER JOIN Table2 aliasTable2 on AliasTable2.Id = aliasTable1.table2Id
  where alaisTable1.Name = 'stringValue2'
  ORDER BY alaisTable1.Time

私は変換でこのクエリで本当に壁にぶつかったので、完全な答えではないにしても、少なくとも出発点を手に入れたいと思っています!

乾杯

4

2 に答える 2

4

This will depend slightly on your mappings, but something like this should work:

Table1 aliasTable1 = null, secondAliasTable1 = null, thirdAliasTable1 = null;
Table2 aliasTable2 = null;

var result = session.QueryOver<Table1>(() => aliasTable1)
    .Where(p => p.Name == "stringValue1")
    .JoinQueryOver(p => p.Table2, () => aliasTable2)
    .SelectList(list => list
        .Select(() => aliasTable1.Id)
        .Select(() => aliasTable1.Time)
        .Select(() => aliasTable2.Version)
        .SelectSubQuery(
            QueryOver.Of<Table1>(() => secondAliasTable1)
                .Where(() => aliasTable1.Time < secondAliasTable1.Time)
                .WithSubquery.Where(() => secondAliasTable1.Time <
                    QueryOver.Of<Table1>(() => thirdAliasTable1)
                        .Where(() => thirdAliasTable1.Name == "stringValue1")
                        .And(() => thirdAliasTable1.Id == aliasTable1.Id)
                        .And(() => thirdAliasTable1.Time > aliasTable1.Time)
                        .SelectList(inner => inner
                            .Select(() => thirdAliasTable1.Time))                            
                        .OrderBy(() => thirdAliasTable1.Time).Asc()
                        .Take(1)
                        .As<DateTime>())
                .And(() => secondAliasTable1.Name == "stringValue2")
                .And(() => secondAliasTable1.Id == aliasTable1.Id)
                .SelectList(third => third
                    .Select(() => secondAliasTable1.Time))
                .OrderBy(() => secondAliasTable1.Time).Asc()
                .Take(1)))
    .OrderBy(() => aliasTable1.Time).Asc()
    .List<object[]>();

This generates SQL that looks something like this:

SELECT this_.Id                            as y0_,
       this_.Time                          as y1_,
       aliastable1_.Version                as y2_,
       (SELECT TOP (1 /* @p0 */) this_0_.Time as y0_
        FROM   [Table1] this_0_
        WHERE  this_.Time < this_0_.Time
               and this_0_.Time < (SELECT TOP (1 /* @p1 */) this_0_0_.Time as y0_
                                             FROM   [Table1] this_0_0_
                                             WHERE  this_0_0_.Name = 'stringValue1' /* @p2 */
                                                    and this_0_0_.Id = this_.Id
                                                    and this_0_0_.Time > this_.Time
                                             ORDER  BY this_0_0_.Time asc)
               and this_0_.Name = 'stringValue2' /* @p3 */
               and this_0_.Id = this_.Id
        ORDER  BY this_0_.Time asc) as y3_
FROM   [Table1] this_
       inner join [Table2] aliastable1_
         on this_.Id = aliastable1_.Table1Id
WHERE  this_.Name = 'stringValue1' /* @p4 */
ORDER  BY this_.Time asc

Instead of .List<object[]>() you could also project to a DTO of your choice (using TransformUsing). If this looks overwhelming, I would strongly recommend breaking each detached QueryOver into it's own variable and then referencing them from the main query.

Update: If you want to use .TransformUsing, you need to create a null result object and use .WithAlias():

Table1 aliasTable1 = null, secondAliasTable1 = null, thirdAliasTable1 = null;
Table2 aliasTable2 = null;
MyDTO dto = null;

var result = session.QueryOver<Table1>(() => aliasTable1)
    .Where(p => p.Name == "stringValue1")
    .JoinQueryOver(p => p.Table2, () => aliasTable2)
    .SelectList(list => list
        .Select(() => aliasTable1.Id).WithAlias(() => dto.Id)
        .Select(() => aliasTable1.Time).WithAlias(() => dto.Time)
        .Select(() => aliasTable2.Version).WithAlias(() => dto.Version)
        .SelectSubQuery(
            QueryOver.Of<Table1>(() => secondAliasTable1)
                .Where(() => aliasTable1.Time < secondAliasTable1.Time)
                .WithSubquery.Where(() => secondAliasTable1.Time <
                    QueryOver.Of<Table1>(() => thirdAliasTable1)
                        .Where(() => thirdAliasTable1.Name == "stringValue1")
                        .And(() => thirdAliasTable1.Id == aliasTable1.Id)
                        .And(() => thirdAliasTable1.Time > aliasTable1.Time)
                        .SelectList(inner => inner
                            .Select(() => thirdAliasTable1.Time))                            
                        .OrderBy(() => thirdAliasTable1.Time).Asc()
                        .Take(1)
                        .As<DateTime>())
                .And(() => secondAliasTable1.Name == "stringValue2")
                .And(() => secondAliasTable1.Id == aliasTable1.Id)
                .SelectList(third => third
                    .Select(() => secondAliasTable1.Time))
                .OrderBy(() => secondAliasTable1.Time).Asc()
                .Take(1)).WithAlias(() => dto.Time2))
    .OrderBy(() => aliasTable1.Time).Asc()
    .TransformUsing(Transformers.AliasToBean<MyDTO>())
    .List<MyDTO>();
于 2012-08-23T13:40:44.570 に答える
0

HQLを使用して、エンティティをテーブルに既にマッピングしていると仮定します。

結合は、次のように明示的に行うことができます。

Select aliasTable1.Id, aliasTable2.Version
  from Table1 as aliasTable1
    JOIN aliasTable1.table2 as aliasTable2;

また、HQLでTop in Inner Queriesを使用できるかどうかわからないため、次のように変更できます。

AND secondAliasTable1.Time < (SELECT max(thirdAliasTable1.Time) from Table1 as thirdAliasTable1 
                                where thirdAliasTable1.Name = 'stringValue1'
                                  AND thirdAliasTable1.Id = aliasTable1.Id
                                  AND thirdAliasTable1.Time > aliasTable1.Time)

また、クエリでこれら4つのプロパティ（id、time、version、endTime）のみを含むDTOのリストを返す場合は、Transformers.aliasToBean（）を確認する必要があります。

私はここで一度それについて何かを書きました：http：//hordine.com/ ？p = 1187

于 2012-08-23T11:03:29.157 に答える